Nikolay Simov

Sex chromosome pre-reduction in male meiosis of Lethocerus patruelis (Stål, 1854) (Heteroptera, Belostomatidae) with some notes on the distribution of the species

Abstract The karyotype and meiosis in males of giant water bug Lethocerus patruelis (Heteroptera: Belostomatidae: Lethocerinae) were studied using standard and fluorochrome (CMA3 and DAPI) staining of chromosomes. The species was shown to have 2n = 22A + 2m + XY where 2m are a pair of microchromosomes. NORs are located in X and Y chromosomes. Within Belostomatidae, Lethocerus patruelis is unique in showing sex chromosome pre-reduction in male meiosis, with the sex chromosomes undergoing reductional division at anaphase I and equational division at anaphase II. Cytogenetic data on the family Belostomatidae are summarized and compared. In addition, the structure of the male internal reproductive organs of Lethocerus patruelis is presented, the contemporary distribution of Lethocerus patruelis in Bulgaria and in the northern Aegean Islands is discussed, and the first information about the breeding and nymphal development of this species in Bulgaria is provided.

Sixth European Hemiptera Congress

Since 1998, when the First European Hemiptera Congress (EHC) took place in the small seaside resort Amaliapolis, Greece, the Hemiptera congresses are regularly held every two-three years: EHC 2 in Fiesa, Slovenia (2001), EHC 3 in St. Petersburg, Russia (2004), EHC 4 in Ivrea, Italy (2007) and EHC 5 in Velence, Hungary (2009).

New dragonflies and damselflies from Middle Miocene deposits in SW Bulgaria (Insecta: Odonata)

The first fossil Odonata discovered in Bulgaria are described and illustrated, i.e., the aeshnid Oligaeschna bulgariensis sp. nov., the sieblosiid Stenolestes rhodopensis sp. nov., and the dysagrionid Primorilestes magnificus sp. nov. These genera are present in both Western Europe and Siberia in the Neogene. Their fossil discoveries in Bulgaria provide a link between these two regions, which are now disconnected. Andre Nel. Institut de Systématique, Évolution, Biodiversité, ISYEB UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F75005, Paris, France. anel@mnhn.fr Nikolay Simov. National Museum of Natural History, 1 Tsar Osvoboditel Blvd., 1000 Sofia, Bulgaria. myrmedobia@gmail.com Vladimir Bozukov. Institute of Biodiversity and Ecosystem Research Bulgarian Academy of Sciences, Acad. G. Bonchev Str., 23, BG-1113 Sofia, Bulgaria. vladimir_bozukov@yahoo.com Milen Marinov. Plant Health & Environment Laboratory, Investigation and Diagnostic Centre and Response, Ministry for Primary Industries, 231 Morrin Rd, Auckland, New Zealand. milen.marinov@mpi.govt.nz

Achiasmate male meiosis in two Cymatia species (Hemiptera, Heteroptera, Corixidae).

Abstract The karyotype and male meiosis, with a particular focus on the presence or absence of chiasmata between the homologs, were studied in the water boatman species Cymatia rogenhoferi (Fieber) and Cymatia coleoptrata (Fabricius) (Corixidae, Cymatiainae). It is shown that the species have 2n = 33 (28A+2m+X1X2Y) and 2n = 24 (20A+2m+XY) respectively, post-reduction of sex chromosomes, and achiasmate meiosis of an alignment type in males. Cytogenetic and some morphological diagnostic characters separating Cymatia Flor from the rest of Corixidae are discussed.

Karyotype, sex determination and male meiosis in three benthic water bugs (Hemiptera: Nepomorpha: Aphelocheiridae)

ABSTRACT We report here the first chromosome numbers for benthic water bugs (Nepomorpha: Aphelocheiridae). All three studied species, Aphelocheirus aestivalis (Fabricius, 1794), A. murcius Nieser and Millán, 1989 and Aphelocheirus sp. from Ebro River (northern Spain), have karyotype 2n = 22 + XX/X(0) and inverted sequence of the X chromosome divisions in male meiosis. The similarity and difference in cytogenetic traits between Aphelocheiridae and other families of Nepomorpha are shortly discussed.

A new Cleotomiris species (Hemiptera: Heteroptera: Miridae: Phylinae) from North Korea

Cleotomiris josifovi is described from the vicinity of Pyong Kang, North Korea. The description of this new species is provided with scanning micrographs of selected structures, and digital microscopic images of habitus and genitalia.